package com.kkw.shoppingmall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.kkw.common.to.mq.OrderTo;
import com.kkw.common.to.mq.StockDetailTo;
import com.kkw.common.to.mq.StockLockedTo;
import com.kkw.common.utils.R;
import com.kkw.shoppingmall.ware.enume.OrderStatusEnum;
import com.kkw.shoppingmall.ware.entity.WareOrderTaskDetailEntity;
import com.kkw.shoppingmall.ware.entity.WareOrderTaskEntity;
import com.kkw.shoppingmall.ware.exception.NoStockException;
import com.kkw.shoppingmall.ware.feign.OrderFeignService;
import com.kkw.shoppingmall.ware.feign.ProductFeignService;
import com.kkw.shoppingmall.ware.service.WareOrderTaskDetailService;
import com.kkw.shoppingmall.ware.service.WareOrderTaskService;
import com.kkw.shoppingmall.ware.vo.*;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.kkw.common.utils.PageUtils;
import com.kkw.common.utils.Query;

import com.kkw.shoppingmall.ware.dao.WareSkuDao;
import com.kkw.shoppingmall.ware.entity.WareSkuEntity;
import com.kkw.shoppingmall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    private WareSkuDao wareSkuDao;

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Autowired
    private WareOrderTaskService orderTaskService;

    @Autowired
    private WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    private OrderFeignService orderFeignService;

    @Override
    public void unLockStock(StockLockedTo to) {
        StockDetailTo detail = to.getStockDetailTo();
        Long skuId = detail.getSkuId();
        Long detailId = detail.getId();
        //解锁
        //1、查询数据库关于这个订单锁定库存的信息
        // 没有：库存锁定失败了，导致库存已经回滚了 ，这种情况下无需解锁

        // 有： 证明库存锁定成功了
        //      1、没有这个订单，必须解锁
        //      2、有这个订单，则不是分为一下几种情况
        // 订单状态： 已取消：解锁库存
        //          没取消，不能解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            /**
             * 库存工作单的id
             */
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();
            //根据订单号查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });

                if (data == null || data.getStatus().equals(OrderStatusEnum.CANCLED.getCode())) {
                    //1订单不存在
                    // 2订单已经被取消了  ，才能解锁库存
                    if (byId.getLockStatus() == 1) {
                        //当前库存工作单详情，状态1 已锁定但是为解锁才可以解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
//                    channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
                }
            } else {
                //消息拒绝以后重新放到队列里面     ，让别人继续消费解锁
//                channel.basicReject(message.getMessageProperties().getDeliveryTag(),true);
                throw new RuntimeException("远程服务失败");
            }
        } else {
            //无需解锁   手动应答
//            channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
        }
    }


    @Transactional(rollbackFor = Exception.class)
    @Override
    public void unLockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新库存解锁的状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> list = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));

        for (WareOrderTaskDetailEntity entity : list) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }


    /**
     * 解锁库存
     *
     * @param skuId
     * @param wareId
     * @param num
     */
    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //库存解锁
        wareSkuDao.unLockStock(skuId, wareId, num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        //变为已解锁
        entity.setLockStatus(2);
        orderTaskDetailService.updateById(entity);
    }


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (StringUtils.isNotBlank(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (StringUtils.isNotBlank(wareId)) {
            queryWrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    /**
     * 将采购成功的入库
     *
     * @param skuId
     * @param wareId
     * @param skuNum
     * @return
     */
    @Override
    public double addStock(Long skuId, Long wareId, Integer skuNum) {
        // 1.如果还没有这个库存记录 那就是新增操作
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        double price = 0.0;
        // TODO 还可以用什么办法让异常出现以后不回滚？高级
        WareSkuEntity entity = new WareSkuEntity();
        try {
            R info = productFeignService.info(skuId);
            Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");

            if (info.getCode() == 0) {
                entity.setSkuName((String) data.get("skuName"));
                // 设置商品价格
                price = (Double) data.get("price");
            }
        } catch (Exception e) {
            System.out.println("com.Kevin.mall.ware.service.impl.WareSkuServiceImpl：远程调用出错");
        }
        // 新增操作
        if (entities == null || entities.size() == 0) {
            entity.setSkuId(skuId);
            entity.setStock(skuNum);
            entity.setWareId(wareId);
            entity.setStockLocked(0);
            wareSkuDao.insert(entity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
        return price;
    }

    /**
     * 返回该skuId对应的商品是否有库存
     *
     * @param skuIds
     * @return
     */
    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(item -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前的库存量
            Long count = baseMapper.getSkuStock(item);
            vo.setSkuId(item);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }


    /**
     * 为某一个订单锁库存
     *
     * @param vo
     * @return 库存解锁的场景
     * 1）下单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存
     * 2）下单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚
     * 之前锁定的库存就要自动解锁（本来是用seata来做分布式事务的 但是太慢了是个串行化操作了  所以使用mq来做）
     * @Transactional(rollbackFor = NoStockException.class) 默认只要是运行时异常都会回滚
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单的详情
         * 追溯（万一有问题了可以知道是哪个仓库 哪个单有问题）
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);


        //1、本来应该按照下单的收获地址，找到一个就近仓库，锁定 库存。(暂时不这么做 )

        //1、（先用这样的方法做） 找到每个商品在哪个仓库中有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        Boolean allLock = true;
        //锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds != null && wareIds.size() == 0) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1、如果每一个商品都锁成功，将当前商品锁定了几件的工作单记录发给mq
            //2、如果锁定失败，前面保存的工作单信息就回滚了（现在暂时这样处理，即使回滚了工作单信息，虽然mq里面还有这个工作单的信息，那么我们还会
            // 去库里面查一次，到时候会查不到id,所以就不用解锁）
            for (Long wareId : wareIds) {
                //成功就返回1 ，否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    //todo 告诉mq库存锁定成功
                    WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(taskDetailEntity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(taskDetailEntity, stockDetailTo);
                    lockedTo.setStockDetailTo(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                } else {
                    //当前仓库失败，重试下一个仓库

                }
            }
            if (skuStocked == false) {
                //当前商品所有仓库都没锁住
                throw new NoStockException(skuId);
            }
        }
        //3、肯定全部都是锁定成功的

        return true;
    }


    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }
}